We're dividing 13397509 by 863 
The aim is to understand the frequency of 863 in 13397509.

Step 1:
863 can be fit into 1 0 times, resulting in a remainder of 1.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 1, we get 1.
Take the next digit (3) from the dividend and append it to 1, then repeat: 13 / 863

Going ahead to step 2:
If we divide 13 by 863, we get 0 and a remainder of 13.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 13 and we're left with 13.
Take the next digit (3) from the dividend and append it to 13, then repeat: 133 / 863

Going ahead to step 3:
133 divided by 863 is 0 with a remainder of 133.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 133 after subtracting 0 from 133.
Take the next digit (9) from the dividend and append it to 133, then repeat: 1339 / 863

Let's proceed to step 4:
When dividing 1339 by 863, we get 1 with a remainder of 476.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
Subtracting 863 from 1339 leaves us with 476.
Take the next digit (7) from the dividend and append it to 476, then repeat: 4767 / 863

Step 5:
863 can be fit into 4767 5 times, resulting in a remainder of 452.
The next digit of our result is 5. 
Result so far: 15.0
If we subtract 4315 from 4767, we get 452.
Append the next digit (5) from the dividend to 452 and continue with: 4525 / 863

Moving on to step 6:
863 can be fit into 4525 5 times, resulting in a remainder of 210.
Use 5 as the next digit of our solution. 
Result so far: 155.0
The remainder is 210 after subtracting 4315 from 4525.
Fetch the next digit (0) from the dividend, attach it to 210 and continue: 2100 / 863

Let's proceed to step 7:
863 can be fit into 2100 2 times, resulting in a remainder of 374.
Put 2 as the next digit of the answer. 
Result so far: 1552.0
Subtracting 1726 from 2100 leaves us with 374.
Take the next digit (9) from the dividend and append it to 374, then repeat: 3749 / 863

Going ahead to step 8:
When dividing 3749 by 863, we get 4 with a remainder of 297.
The number 4 becomes the next digit in our result. 
Result so far: 15524.0
If we subtract 3452 from 3749, we get 297.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2970, and continue the process.

Advancing to step 9:
863 can be fit into 2970 3 times, resulting in a remainder of 381.
The number 3 becomes the next digit in our result. 
Result so far: 15524.3
If we take 2589 away from 2970, we end up with 381.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3810, and continue the process.

Moving on to step 10:
3810 divided by 863 is 4 with a remainder of 358.
The next digit of our result is 4. 
Result so far: 15524.34
Deduct 3452 from 3810 and we're left with 358.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3580, and continue the process.

On to step 11:
3580 divided by 863 is 4 with a remainder of 128.
The next digit of our result is 4. 
Result so far: 15524.344
Subtracting 3452 from 3580 leaves us with 128.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1280, and continue the process.

Our division results in 15524.344 with a remaining 0.0128.